Carlos Rodon’s plus fastball and elite slider are probably enough to get him by in the majors in the estimation of one talent evaluator.

But a month into his professional career the White Sox and their top prospect have made the improvement of Rodon’s changeup one a priority.

Rodon — the third overall pick in June’s amateur draft — believes command of his changeup will make him a better major leaguer, whenever the White Sox decide to make that happen.

The left-handed pitcher out of North Carolina State is already viewed as a great talent: MLB.com rates him the No. 22 prospect in baseball while ESPN’s Keith Law ranked him No. 10 last month. Baseball America’s JJ Cooper unofficially has Rodon rated between 40-45.

But if Rodon can hone his changeup, he’s capable of reaching the next level, MLB.com’s Jim Callis said.

“To some extent he probably could live off the fastball and the slider because the slider is that good that hitters can’t really sit on the fastball,” Callis said. “The changeup is just going to mess with guys more and I think the changeup is what makes him an elite pitcher.”

When he helped lead N.C. State to the College World Series in 2013 with 184 strikeouts in 132 1/3 innings as a sophomore, Rodon set some nearly impossible standards for himself.

He only added to those expectations, ones Rodon said in June he “didn’t live up to,” with a dominant performance for Team USA against Cuba. Callis didn’t attend the exhibition but said evaluators there for the 11-strikeout game believed Rodon could have won in the majors that night, in part because he showed an outstanding changeup.

Headed into 2014, Rodon was viewed as the consensus No. 1 player in the draft and one American League scout said Rodon was already a “top 10 pitcher on the planet.”

But the combo of a 6-7 record and a disappointing season for the Wolfpack affected Rodon’s draft value, even though he lowered his ERA from 2.99 in 2013 to 2.01.

Callis thinks NC State asked Rodon to rely on his slider too much early in the season and that led to less command and reduced velocity of a fastball that MLB.com ranked 65 on the 20-80 scouting scale. MLB.com grades his slider a 70 while his changeup, which Rodon said he rarely used his junior season, is a 50.

Since he signed a franchise-record $6.582 million bonus on July 11, much of the work Rodon has done surrounds his changeup as well as fastball command. Whether playing catch, in bullpen sessions or in games, Rodon estimates he has thrown double or triple the amount of changeups he did in college.

“I’ve had to make a couple of adjustments to pro ball as far as pitching and pitch sequences,” Rodon said. “I understand now that anyone can hit a fastball and I have to use those offspeed pitches to compliment the fastball. I’ve been relying heavily on the changeup recently and it’s working out pretty good for me.

Rodon — who struck out three over three scoreless innings on Thursday and will start again Wednesday for Single-A Winston-Salem — threw five or six changeups in his 39 pitches and said it’s the best he has felt with it so far.

Prior to him joining the White Sox, minor-league pitching coordinator Curt Hasler hadn’t seen much of Rodon’s changeup.

So far Hasler, who has been on hand for three of Rodon’s five appearances, including Thursday, has been impressed.

“I saw the fastball, the good life on the fastball, the plus-plus slider,” Hasler said. “I didn’t see a lot of changeups so I didn’t really know what to expect. But from Day One when I saw his changeup, I told (Single-A pitching coach J.R. Perdew), ‘Wow, that’s a good changeup.’ It’s almost like maybe he didn’t need it before.

“He threw it five or six times the other day in the game. We saw a handful of really good ones that day. It’s making a lot of progress. He knows exactly what he’s going to have to do with all those pitches.”

Callis said it’s all part of the package the White Sox received when Rodon slipped to them at No. 3. Having thrown several high-profile games over the last three years, Rodon has valuable experience on big stages to pair with a good pitching mentality.

“He knows there’s more than just rearing back and trying to throw the ball by guys,” Callis said. “He’s also got the confidence without being cocky although he probably straddled cocky a little bit in a good way. He’s got everything you want. He’s got the stuff. He understands what he needs to do. He’s really highly competitive.”

Even though he has the confidence he is close to, if not, ready for the majors, Rodon isn’t worried. He tries to focus on the things he can control, even when manager Robin Ventura said there’s a better than average chance Rodon could pitch in the big leagues this season. Rodon said he would leave that decision for “the bosses up there” and only wants to further develop his game, especially the changeup.

“I’m throwing it while I’m playing catch, throw it in the pen for sides and the game, as it comes along,” Rodon said. “My last outing, I had a pretty good feel for it and it’s only getting better.

“I’m starting to get that command back and that feel for everything. You get a little breakthrough every time you pitch and I hit one this last outing. I’m getting there.”

The Cardinals have always emphasized building from within. In the 2016-17 offseason, however, they may end up being one of the bigger free agent buyers. At least according to some informed speculation.

The Cardinals are already losing their first round pick due to the Fowler signing, so any other top free agent won’t cost them more than the money he’s owed. And as far as money goes, the Cardinals have a great deal of it, despite being a small market team. They have a billion dollar TV deal coming online and Matt Holliday and Jaime Garcia are off the payroll now. Spending big on a free agent or three would not cripple them or anything.

Encarnacion or Trumbo would be first baseman, which wold fly in the face of the Cards’ move of Matt Carpenter to first base (and, at least as far as Encarnacion goes, would fly in the face of good defense). Getting either of them would push Carpenter back to second, displacing Kolten Wong, or over to third, displacing Jhonny Peralta. If you’re going to do that, I’d say that Turner would make more sense, but what do I know?

Either way, the Cardinals may be entering a pretty interesting phase of their offseason now. And an unfamiliar one as, quite possibly, the top free agent buyer on the market.

There is literally nothing you could tell me that the incoming administration is considering which would shock me anymore. As such, I saw this story when I woke up this morning, blinked once, took a sip of coffee, closed the browser window and just went on with my morning, as desensitized as a wisdom tooth about to be yanked.

Rob Bradford of WEEI.com reports that Former Red Sox, Mets and Rangers manager Bobby Valentine is on a short-list of candidates for the job of United States Ambassador to Japan:

The 66-year-old, who currently serves as Sacred Heart University’s athletics director, has engaged in preliminary discussions with President-elect Donald Trump’s transition team regarding the position.

Valentine managed the Chiba Lotte Marines of Japan’s Pacific League for six seasons, leading the team to a championship in 2005. He also knows the current prime minister of Japan, Shinzo Abe, as both went to USC. Assuming championship teams meet the country’s leader in Japan like they do in the United States, Valentine has at least twice the amount of experience with top political leaders than does, say, Ned Yost, so that’s something.

The former manager, more importantly, is friends with Donald Trump’s brother, with the two of them going way back. Which, given how this transition is going, seems like a far more important set of qualifications than anything else on this list.